Drilling and countersinking tool



March 15, 1927. n 1,620,848

M. B. WILDER i DRILLING AND COUNTERSINKING 'no ,'L

Filed April 13, 1925 2 6 8 vvueftoz B. Wi lder.

atroz my hanging portion of Vwhich terminates in a vertical bearing sleeve '18 in which is slidably mounted for vertical movement a pilot.v

. a hollow chuck 24 which has bearing at opposite ends in the arms 22 and which extends upwardly beyond the arms and is.

provided on its upper end with an outwardly flanged head 25.

Referring now more particularly to Figures 3 to 7 inclusive, the hollow chuck isl adapted to receive in its upper end the com bination countersinkingv and drilling' tool forming a part of this invention, and this tool includes aI pair of opposed, segmental projections or cutting-blades 26 having inclined', flat surfaces 27, said blades 26 per? vforming the operation of countersinking. The inclination of each surface v27 is uniform and receding toward the distal end of the tool from the blades 26, said blades or projections during operation moving in advance of the inclined surfaces, it being understood that the rotation of the tool is reverse toa clockwise movement. This -construction is of great advantage in vcounterrsinking various kinds of materiall used for the linings since clean cuts are made and abrasions and roughening of the `material are avoided. These countersinking projections 26 are formed upon the outer face of an enlarged head 28l which, is adapted to rest upon the head 25 of the chuck, the head 23 of the countersinking member having a hollow shank 29 adapted to snugly lit in the opening 21 oit the Ahollow chuck 24. The.

head 28 of the countersinking member is recessed in opposite sides and the recess in each side has an inclined outwardly deiiecting face 30 which recedes inwardly from'the 'inclined surface 27 and is curved rearwardly from the direction in which the tool -i's adapted to operate.

The shank 29 ot the countersinking mem ber is provided in one side and in spaced relation to its lower end with a transverse recess 31, and also hasfa flattened ace'32 in the same side and at its lower end for the purpose ot' permitting the shank 29 to be inserted and withdrawn from the chuck 21 when adjusted therein to escape a transverse locking pin 33 which is secured through one side of the chuck 21 and in such position as to intersect the bore or opening through the rshank 21. This arrangement is shown particularly in Figures 4 to r7, and it will be seen that,` when theshank 29 is turned in Lcadsas the chuck 21 the liat face 32 is moved at one end into position beneath the pin 33 and forms ashoulder or projection to prevent the pulling upwardly of the countersinking member; such as when the brake band with its lining is pulled'from the tool after the drilling operation. The transverse recess or opening 31 inthe shank 29 provides a fiat face 34 against which is adaptedv to seat the lower flat projecting'lug35 which isfformed upon the innerv end of the drill bit 36. The inner end of thel drill bit 36, above the projeetion- 35 terminates in a flat shoulder 37 which is adapted to seat upon a correspondingly formed shoulder 38 provided in the shank 29 at the top of the vlat ace'34 `as clearly shown in `Figures 4 and 5. The pro*- jection 35 of the drill bit 36 is adapted `to hold the drill bit from turning in the countersinking` member, and the pin 33 is adapted to hold the countersinking member from turning beyond a predetermined extent in the hollow chuck 21. The pulley 23may be removably secured to the chuck 21 by a set screw 39 or the like as shown in Figure v3 so that the various intertittingV parts may be turned as a unit by the pulley 23 and -atfthe same time set screws and other devices usually employed in connection with chucks, bits and the like are eliminated and positive connecting ymeans is provided which are readily releasable when the parts are moved in directions opposite to that in which they normally operate.y v

Forthe purpose oi supporting the chuck 24 and the, tool, and for taking up thrust of the pilot rod 19 and otherv pressure exerted downwardly upon the tool when in operation, an anti-friction bearing support is provided in the formof a pair of discs or plates 40 provided with annular race ways in their opposite faces adapted to receive ball bearings 41 or the like to permit ofthe free turning` oli-the discs one 'upon the other and tok take up frictional contact between the relatively movable parts. f

The motor 15 is connected to the pulley 23 by a belt 42 or the like which is trained over a'pulley 43 carried by the motor 15, or any means may be re- `drilling and countersinking tool, the parts are forced together and, as the upper end lower portions of the heady 17 are in coaxial and vertical alignment, the band 45 has itsy opening 46 `brought and maintained in proper register with the drill bit 36, so that as the chuck 24 with its parts is rotated the lining will be apertured in true coaxial alignment with the opening 46 in the brake band, and the count-ersink about the aperture in the lining'44 will be truly concentric with respect to the aperture. It will be understood that brake lining is composed of rough surfaced material which is easily bruised and that the shoulder 51, which is at substantially a right angle with respect to the side wall 26 of theimproved tool, functions as a top for limiting the depth of the countersink 47 in a manner whereby the material is not injured, by means of beveled or inclined facets 50 .as later explained. It will be noted that the shoulder 51 is at, substantially a right angle with respect to the side wall 26 of the improved tool, and thus functions as a stop for limiting the depth of.

the countersink 47. Various tools may be provided with countersinking projections 26 of different depths and these tools may be quickly interchanged in the chuck 21 for brake linings of different thicknesses or sizes,

c and'such interchange may be made simply by partially turning the shank 29 of the combined tool in the chuck 21, so as to move the face or project-ion 32 from beneath the pin 33, when the tool may be lquickly drawn upwardly and a different one inserted. This same adjustment may also be effected with respect to the drill bit 36 as it may be quickly and easily removed upon breakage or where interchange is otherwise required. No adjustment of set screws or like devices is necessary and the entire machine may thus be operated with rela-tive speed, and no great amount of care need be exercised in the interfitting or adjustment of the parts because as f soon as the machine is set into operation` the parts automaticallyy become interlocked.

As shown in Figure 3 the lining 44 is provided with a countersink 47 in which the head 48 of a rivet maybe seated while the shank 49 of the rivet passes through the outer portion of the lining 44 and then through the opening 46 of the brake band 45. rIhe outer end of the rivet 49 is flanged or spread over against the outer surface of the brake band to hold the parts together. v

The pin 33 engages the shoulder 32 and holds the shank 29 and the tool from lifting upwardly out of the chuck 21 when the brake lining with itsbandis pulled upwardly to release the-same from the machine.

The recesses and inclined faces 30 in the opi posite sides of the head 28 of the countersinking toolV are provided for the purpose of carrying and throwing off the chips orfragments which are cut from the-lining 44 dur ing the countersinking operation, these fragments are thrown outwardly and away from the drill and the counterbore as theinclined faces 30 not only slope backwardly `with respect to the directionofrotation of the tool, but also slope inwardly from the axial or central portion of the tool. j

In the operation of countersinking, the projections 26 move into the lining until the outer end of the head engages the concave side of the lining and at that time thetool Will be rotating. In orderthat the lining will not become cut or injured by the revoluble movement of the head 28 a pair of inclined facets 50 are formed in the top of the head, the inclination of each facet being toward a recess 30. It will be noted that the tool rotates in a counterclockwise direction when looking down upon the tool from above and, as shown in Figure 4, the tool is rotated towards the right thus bringing the inclined facets 50 first into contact with the rough lining. On account ofthe inclined surfaces 1 or facets 50 of the shoulder 51 the lining is guided or gradually -pressed upward into j contact with the horizontal portion of the shoulder 51, and an account of this construction `and operation injury to the lining is avoided.

I do not wish to be restricted to the size, form, and proportions of the various parts, and obviously changes could be made in the construction herein described without departing from the spirit of the invention, it

lbeing only necessarythat such changes fall within the scopeof the appended claim.

What is claimed is A drilling and countersinking tool for use with a chuck having a cross pin, comprising a countersinking member having a head c and a shank on the inn-er end ofthe head for seating in a chuck, said head having count-ersinking projections on its outer end and proi vided with an axial opening extending inwardly through vsaid projections, head and shank, vsaid shank having* a deep recess in one side to receive the cross pin yof the chuck and intersecting the opening at its upper end to provide a flat face in the recess and a shoulder at the top of thev flat face,

lio

comprising the bottom of said axial opening,

and a drill bit removably fitting in the axial opening and engaging said seat at its inner end, said drill bit havinga projection .at one side adapted to engage the flat face of said shoulder to hold the drill bit from turning in the countersinking member. j l

Intestimony whereof, I have affixed my signature. f

,MORRIS B. IILDER. 

